Basalt

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Amethyst

Silicon dioxide with iron impurities (SiO2 + Fe3+)

Epidote (Unakite-related)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Carnelian

Carnelian (Silica, SiO2)

Banded Agate (specifically Carnelian Agate / Sardonyx)

Silicon Dioxide (SiO2) with iron oxide inclusions

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO₂)

Carnelian

Carnelian Chalcedony (SiO2 with Iron Oxide impurities)

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Eclogite

Eclogite (Omphacite-Garnet Metamorphic Rock)

Greenstone / River Jadeite pebble

Metavolcanic rock / Chlorite or Actinolite-rich schist

Sunstone (Feldspar variety)

(Ca,Na)(Al,Si)4O8 with Hematite or Goethite inclusions

Sunstone (Aventurine Feldspar)

(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3

White Agate / Chalcedony

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sunstone

Oligoclase or Andesine (Feldspar Group), (Ca,Na)((Al,Si)4O8)

Banded Agate (Agate Slice)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Sapphire (Blue)

Corundum (Al2O3)

Greenstone / Quartzite Pebble

Metamorphosed Quartz-rich Rock

Peridot (Olivine)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Scoria (Lava Rock)

Scoria

Amethyst (Rose de France varieties or Amethystine Quartz)

Silicon Dioxide (SiO2) with iron impurities

Sunstone

Oligoclase (Plagioclase Feldspar Group) - (Ca, Na)(Al, Si)4O8

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sunstone (Feldspar)

Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)

Amethyst Geode Fragment

Amethyst (Silicon Dioxide, SiO2) with Quartz matrix

Larimar

Pectolite (NaCa2Si3O8(OH))

Scoria (Lava Rock)

Scoria

Lake Superior Agate

Chalcedony (cryptocrystalline Quartz, SiO2) with iron oxide inclusions

Chert (Lake Superior Agate variant)

Microcrystalline Quartz (SiO2)

Scoria (Lava Rock)

Scoria (extrusive volcanic rock)

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Agate Geode

Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals

Olivine (Peridot in gem form)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Copper

Native Copper (Cu)

Eye Agate (Sulemani Agate)

Banded Chalcedony (SiO2)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Carnelian Agate

Carnelian (Silicon Dioxide - SiO2 with Iron Oxide impurities)

Lake Superior Agate

Banded Chalcedony (Silicon Dioxide, SiO2)